notation_schema
Fetch the JSON Schema (Draft 2020-12) describing the notation_render input shape. Includes every field, its type, defaults, validation rules (including the shorthand-string regex pattern), and $defs for Instrument, VoiceLine, Note, and NoteObject. WHEN TO USE: first encounter with this MCP and yo...
This record as markdown: /tools/com-gradusmusic-notation/notation-schema.md
What notation_schema does on Gradus Notation
AI agents call notation_schema to retrieve information from Gradus Notation without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why notation_schema is rated Low
This is a pure read operation that returns metadata (a JSON Schema definition). It queries structural information about the notation_render input format without creating, modifying, executing, or deleting anything.
From the tool's definition Tool name: notation_schema. Description: 'Fetch the JSON Schema...describing the notation_render input shape.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs notation_schema safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Gradus Notation, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For notation_schema, this is the rule to start with:
notation_schema is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Gradus Notation, apply this rule, and every notation_schema call is checked against it from then on.
Questions about notation_schema
Fetch the JSON Schema (Draft 2020-12) describing the notation_render input shape. Includes every field, its type, defaults, validation rules (including the shorthand-string regex pattern), and $defs for Instrument, VoiceLine, Note, and NoteObject. WHEN TO USE: first encounter with this MCP and you want machine-readable type definitions; building a client that validates input client-side before calling notation_render; generating code (TypeScript types, Zod schemas, etc.) that consumes the format. WHEN NOT TO USE: after caching the response (stable across the v1 API); when you want learning-by-example (use notation_examples instead — worked payloads are easier to read than schema definitions). INPUT: none. Pass an empty object {}. OUTPUT (JSON): { ok: true, schema: { $schema: "https://json-schema.org/draft/2020-12/schema", $id, title, type: "object", required: ["instruments"], properties, $defs: { Instrument, VoiceLine, Note, NoteObject } }, docs: { examples, render, validate }, attribution }. The schema field is a complete JSON Schema document. EXAMPLE INPUT: {} (no parameters) TYPICAL LATENCY: 30-200 ms. Response is cached at CDN with long TTL — subsequent calls are essentially free. It is categorised as a Read tool in the Gradus Notation MCP Server, which means it retrieves data without modifying state.
Register the Gradus Notation MCP server in PolicyLayer and add a rule for notation_schema: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Gradus Notation. Nothing to install.
notation_schema is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the notation_schema rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for notation_schema. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
notation_schema is provided by the Gradus Notation MCP server (@gradusmusic/notation-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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